【Superb Quality】 Our milling cutters are made of premium steel and extra-hard carbon steel with a titanium coating, and the cutting edge is hardened and honed for superior sharpness. Durable and won't rust easily. 【6 Different Sizes】 Contains the following sizes: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm; The handle diameter. These universal sizes are compatible with various types of drilling machines, including vertical drilling machines and/or standard milling cutters. 【Outstanding Performance】 With quick change, the three-flute drill bit with groove, a 90° angle on the tip for precise and proper milling, suitable for working with metal and some non-metallic materials. 【Sharper and Stronger】 The drill bit set uses high-frequency hardening for heat treatment, high-density grinding, and titanium to prevent rust. High strength and good toughness. This kit is perfect for DIY projects in the office, workshop, or home, and allows for easy drilling without stress or burrs. 【Various